A sample of oxygen occupies a volume of 350 mL at 35 C. What volume will it occupy at 85 °C?

To prepare 1.00 L of a 0.030 M solution of ethylenediamine (ED), 1.80 g of ED is required.

To find out how much of the compound ethylenediamine (ED) is required to prepare a 0.030 M solution in 1.00 L, we will use the formula:

M = n/V

Where, M is the molarity, n is the number of moles, and V is the volume of the solution in liters.

The molarity of the solution is 0.030 M. We have to find out the number of moles of the compound ethylenediamine (ED) required to prepare this solution.To find out the number of moles, we will rearrange the above equation:

n = M x Vn = 0.030 x 1.00n = 0.030 mol

Now that we know the number of moles required, we can use the formula for the mass of a compound:

M = n x MM

M is the mass of the compound, n is the number of moles, and MM is the molar mass of the compound.The molar mass of ethylenediamine (ED) can be calculated by adding the atomic masses of each of the atoms present in the compound: Molecular formula of ED is H₂NCH₂CH₂NH₂.The atomic masses are:

Atomic mass of H = 1.01 g/mol

Atomic mass of N = 14.01 g/mol

Atomic mass of C = 12.01 g/mol

Molar mass of ED = (2 x 1.01) + (2 x 14.01) + (2 x 12.01)

Molar mass of ED = 60.10 g/mol

Now that we know the molar mass of ED and the number of moles required, we can calculate the mass of ED required to prepare the solution.

M = n x MMM = 0.030 x 60.10M = 1.80 g

Therefore, to prepare 1.00 L of a 0.030 M solution of ethylenediamine (ED), 1.80 g of ED is required.

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The mass of the Pure ethylenediamine that we need is  896 g

The density of a solution is a measure of its mass per unit volume. It is commonly expressed in units such as grams per milliliter (g/mL) or kilograms per liter (kg/L).

To calculate the density of a solution, you need to know the mass of the solution and its volume. The formula for density is:

Density = Mass / Volume

So;

Density = mass/Volume

Mass = 1 000 mL *  0.896 g/ml.

= 896 g

The mass is 896 g

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Answer: The percentage of the (R)-limonene in the sample is 67.24%.

The percentage of the (R)-limonene in a sample of limonene with a specific rotation of -38 can be calculated using the following equation:

Percentage (R)-limonene = (Specific rotation of sample - Specific rotation of (S)-limonene) ÷ (Specific rotation of (S)-limonene) x 100%

In this case, the equation is:

Percentage (R)-limonene = (-38 - (-116)) ÷ (-116) x 100% = 67.24%

Therefore, the percentage of the (R)-limonene in the sample is 67.24%.

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Answer:

1.9992x10^-23

Explanation:

The thing is 6.022*10^23 atoms of carbon is 12g. so 1 atom of carbon will contain:

12/6.022*10^23 = 1.9992x10^-23

hope its clear and helps...

Answer:

A

Explanation:

In chemistry, a mixture is a material made up of two or more different substances which are not chemically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions, and colloids.

Answer:

A

Explanation:

Mixtures can be separated because the different substances have different properties

Since the electron moved from a lower energy level to a higher energy level. The thing that most likely happened during the transition is option  A. A random amount of light was released

An atomic electron transition occurs when an electron moves (or jumps) from one energy level to another inside of an atom or synthetic atom. As the electron is said to often "jumps" from that of a single quantized energy level to those of another, it is one that is usually in a few nanoseconds or less, it appears discontinuous.

Because of the electromagnetic radiation's emission or absorption, atoms and molecules undergo electronic transitions (that is UV or visible). Planck's equation relates the frequency of the electromagnetic wave to the energy change associated with a transition.

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The number of electrons, protons, and neutrons in argon is 18, 18 , and 22 respectively, the number of electrons , protons and neutrons in sulphur-32 is 16, 16, 16 respectively. The number of protons, neutrons, and electrons are 6 , 8 and 6. And for uranium-238 , 92 protons , 92 electrons and 146 neutrons.

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Cornelis Drebbel designed what is believed to be the world's first air conditioning unit, it is work with the system functioned by employing a process called evaporative cooling, which works on the principle of heat absorption by water evaporation.

Drebbel's invention consisted of a wooden box filled with water, a system of rotating paddles, and a fan driven by a clockwork mechanism. The rotating paddles would splash water onto the walls of the wooden box, creating a thin film of water on the surface. As air was drawn into the box, the water would evaporate, absorbing the heat from the incoming air and causing the air temperature to drop. The cooled air was then circulated throughout the room by the clockwork-driven fan.

This early air conditioning unit was able to maintain a comfortable temperature and humidity level in indoor spaces by taking advantage of the natural cooling properties of water. Although the technology was quite rudimentary compared to modern air conditioning systems, Drebbel's invention laid the groundwork for future developments in environmental control and is an essential part of the history of air conditioning. So therefore Cornelis Drebbel designed what is believed to be the world's first air conditioning unit by evaporative cooling process, which works on the principle of heat absorption by water evaporation.

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The number of ionic bond in copper is zero.

Pure copper or any pure metal for that matter are examples of metallic bonds, which are neither ionic nor covalent. The copper atoms are stacked very tightly in a solid lattice. In fact it has a face centered cubic lattice which is the closed packing of atoms possible. Each atom has twelve nearest neighbors which allows their 4s orbitals (mostly) to have the optimal overlap. All of these orbitals therefore combine in one gigantic band of delocalized orbitals that spans the entire crystal with its myriad atoms. This band is only partly filled and the difference in energy between one state and the next is puny, which explains copper’s outstanding conductive properties.

Therefore, the bonding in copper has a metallic character.

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Large organic molecules are usually assembled by polymerization of a few kinds of simple subunits belonging to the same class of chemicals.  The following is an exception to this statement is:

c) Steroids

Large organic molecules, such as proteins, nucleic acids, and carbohydrates, are typically formed through the process of polymerization. Polymerization involves the repetitive bonding of smaller subunits, known as monomers, to form a long chain or polymer. These monomers usually belong to the same class of chemicals, meaning they have similar structures and functional groups.

In the case of DNA, the monomers are nucleotides, which consist of a sugar molecule, a phosphate group, and a nitrogenous base. The repetitive bonding of nucleotides creates a long chain of DNA.

Similarly, cellulose, a major component of plant cell walls, is composed of repeating units of glucose monomers. The polymerization of glucose molecules forms long cellulose chains.

Contractile proteins, such as actin and myosin found in muscle fibers, are also assembled through the polymerization of monomers. These monomers, called amino acids, are linked together by peptide bonds to form polypeptide chains, which then fold into the functional protein structure.

However, steroids, including molecules like cholesterol, estrogen, and testosterone, are an exception to this general pattern of polymerization. Steroids have a distinct structure consisting of four fused carbon rings. They are not formed through repetitive bonding of identical subunits like proteins or nucleic acids. Instead, steroids are synthesized through specific biosynthetic pathways in living organisms.

While steroids play crucial roles in various physiological processes, they do not follow the typical pattern of polymerization seen in other organic polymers.

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The complete question is:

Large organic molecules are usually assembled by polymerization of a few kinds of simple subunits belonging to the same class of chemicals. which of the following is an exception to this statement?

a) DNA

b) cellulose

c) steroids

d) a contractile protein

To find the mole and mass fractions of gas A and gas B, we need to calculate the total pressure and the mole fraction of each gas.

Calculate the total pressure:

Total pressure = partial pressure of gas A + partial pressure of gas B

Total pressure = 50 psi + 45 psi

Total pressure = 95 psi

Calculate the mole fraction of each gas:

Mole fraction of gas A = partial pressure of gas A / total pressure

Mole fraction of gas A = 50 psi / 95 psi

Mole fraction of gas A ≈ 0.5263

Mole fraction of gas B = partial pressure of gas B / total pressure

Mole fraction of gas B = 45 psi / 95 psi

Mole fraction of gas B ≈ 0.4737

Calculate the mass fraction of each gas:

Mass fraction of gas A = (mole fraction of gas A) x (molar mass of gas A) / [(mole fraction of gas A) x (molar mass of gas A) + (mole fraction of gas B) x (molar mass of gas B)]

Mass fraction of gas A = (0.5263) x (25 g/mol) / [(0.5263) x (25 g/mol) + (0.4737) x (20 g/mol)]

Mass fraction of gas A ≈ 0.5556

Mass fraction of gas B = (mole fraction of gas B) x (molar mass of gas B) / [(mole fraction of gas A) x (molar mass of gas A) + (mole fraction of gas B) x (molar mass of gas B)]

Mass fraction of gas B = (0.4737) x (20 g/mol) / [(0.5263) x (25 g/mol) + (0.4737) x (20 g/mol)]

Mass fraction of gas B ≈ 0.4444

Therefore, the mole fraction of gas A is approximately 0.5263, the mole fraction of gas B is approximately 0.4737, the mass fraction of gas A is approximately 0.5556, and the mass fraction of gas B is approximately 0.4444.

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Explanation:

HCOOH (aq) + H2O (l) ⇋ HCOO- (aq) + H3O+ (aq)

acid 1 base 2 base 1 acid 2

STP is a specific set of conditions used for comparing gases, while the standard state is a set of conditions used for comparing the properties of substances in different phases.

Standard temperature and pressure (STP) and standard state are two different concepts used in chemistry and physics to describe the physical and chemical properties of substances. Standard temperature and pressure refer to the conditions of temperature and pressure that are considered standard for measuring and comparing properties of gases. STP is defined as a temperature of 0 degrees Celsius and a pressure of 1 atmosphere (atm). On the other hand, the standard state of a substance refers to the state of the substance at a pressure of 1 atm and at a specific temperature depending on the substance.  The difference between Standard temperature and pressure (STP) and standard state lies in the fact that STP refers to a specific set of conditions, while the standard state can vary depending on the substance. For example, the standard state of water is defined as a liquid at 25 degrees Celsius and a pressure of 1 atm. However, the standard state of a gas may be defined as a gas at 25 degrees Celsius and 1 atm.

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complete question:

What is the difference between standard temperature and pressure (STP) and standard state?

Answer: it will be A nd B hope this helps

Explanation: pls give me brainliest

Turbidity can be given as the presence of haziness or the cloudy nature of the fluid. The turbidity gives the clarity of measurement and may result from human activity.

The turbidity is due to the presence of suspended solute particles in the solution, that are large and small.

The sedimentation of particles results in lower turbidity. The increase in human activities may result in turbidity in the water.

The turbidity is able to stop the growth of the algae and fish biome, and it is not transported via rain.

Thus, turbidity can be given as the measure of water clarity and is the result of human activities. Thus, options A and C are correct.

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Answer:

61

Explanation:

These cybersecurity fundamentals help ensure that authorized parties can access information when needed while also protecting against unauthorized access or denial of service attacks.

Cybersecurity is critical for protecting the confidentiality, integrity, and availability of information in today's digital age. With the increasing reliance on technology, the need for cybersecurity has become essential to safeguard sensitive information and prevent cyber attacks.

Effective cybersecurity involves a multi-layered approach that includes various techniques such as access control, encryption, firewalls, intrusion detection and prevention systems, and regular software updates. It is also important to establish policies and procedures for handling security incidents and conducting regular security audits.

Cybersecurity threats can come in many forms, including malware, phishing scams, social engineering, and advanced persistent threats (APTs). Cyber criminals and hackers use these methods to exploit vulnerabilities in computer systems and steal valuable data.

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Complete Question:-

what cyber security fundamentals where in it makes sure that authorized parties are able to access the information when needed?

In water, sodium bicarbonate dissolves to form sodium and bicarbonate which makes the solution alkaline, which means it can neutralize acid.

An acid is described as a molecule or ion capable of either donating a proton, known as a Brønsted–Lowry acid, or forming a covalent bond with an electron pair, known as a Lewis acid.

sodium bicarbonate is less soluble in water because the density of the water is more than the density of the sodium bicarbonate.

Acids are known to produce hydrogen ions and bases accept hydrogen ions.

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The fossils from the Phanerozoic era are the best preserved due to the following reasons:

These fossils spans from about 541 million years ago to the present day and are considered the best preserved because many organisms developed hard skeletal structures such as shells and bones that are more likely to be preserved as fossils than soft tissue.

Also, the sedimentary rocks are formed by the accumulation and compression of sediment which offer protection and preservation for fossils by preventing decay and erosion. These factors contributed to the high quality and abundance of fossils from the Phanerozoic era.

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Answer:

sorry if wrong

Explanation:

Answer:

mass of the solid is measured before measuring its volume to find the density

Answer:

So you can calculate the density.

Explanation:

Quinone is an example of a T cell immune system.

These refers to the cells and organs present in organisms which are responsible in providing resistance to germs and infections.

T cells form part of the immune system and provide adaptive immune response through attacking foreign bodies in the body.  Quinone reacting with skin proteins and creating a complex that now triggers an immune response depicts the defense mechanism of T cells.

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Answer:

no idea

Explanation:

Answer:

when CO2 gas is passed through lime water it turns milky due to the formation of calcium carbonate which formula is CaCO3.

Ca(OH)2+ CO2------ CaCO3

when excess of carbon dioxide is passed through calcium carbonate calcium hydrogen carbonate is formed and solution become colourless.

CaCO3+CO2------ Ca(HCO3)

Explanation:

They have a directly proportional relationship.

i.e.

when one of them varies in magnitude, the others will also vary directly.

Quantities expressed as products of each other are always inversely proportional & those expressed as quotients are directly proportional with each other.

KE = 1/2mv^2

Thus, we know that m & v in KE are inversely related.

Inverse proportionality - when m increases, v decreases. & vice versa.

Direct proportionality - when v increases KE also increases

If Temperature increases then the probability of atoms to randomly collide with each other increases rapidly.

the rapidity of these atoms result from the increase in speed(v). since v & KE have a direct r/n ship, KE also increases. as a result the atoms get a relatively high freedom of movement compared to that of those in solids.

Given what we know, we can confirm that the interest rate necessary to reach $5500 in 7 years with a starting investment of $4000 on a yearly compounded interest, would be 4.7%.

Since the question did not specify any extra data to be taken into account, such as:

and so on, we can assume that all of these values are null. Therefore, if we take $4000 and add 4.7%, and repeat that every time using our new totals, after 7 repetitions we are left with close to $5500, which is our goal.

Therefore, we can confirm that the interest rate necessary to reach $5500 in 7 years with a starting investment of $4000 on a yearly compounded interest, would be 4.7%.

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Solids exhibit the strongest intermolecular force of attraction.

Particles in a petrol have relatively little attraction to one another. In comparison to the particles in a solid or liquid, they are constantly moving and quite far apart. As the particles collide, they just hit one other and bounce off of one another without engaging in any interaction.

Compared to liquids and gases, solids usually exhibit the highest intermolecular forces. Because the particles in solids are tightly packed, they are incompressible and have a high density.

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During an experiment, spectrophotometer is calibrated after inserting the cuvette containing the analyte,to reduce errors in results.

Errors in chemical analysis result when there is a difference between observed value and the true value.If the magnitude of errors is large , it results in decrease in accuracy, reproducibility, and precision.

There are three types of errors:1) random error 2) systematic error 3) human error.The cause of random errors are difficult to quantify while the human errors can be minimized by taking a range of readings to reduce the error.

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Answer:

"6,000-year-old seeds from an ancient culture" is one example among the following examples given in the question that carbon-14 dating would be appropriate for dating.

Explanation:

Thought you meant by something els sorry :)